Pressure controller



O. ROSCHANEK PRESSUREGQNTROLLER Filed April 9, 1925 3 Sheds-Sheet 3 Patented Dec. 14, 192e.l

UNITED STATES PATENT-lorriesL orzro aoscIIA'NEK,

or VIENNA, AUSTRIA, AssIGNon or ONE-HALF rro THE FIRM AIIUEBNIIR a MAYER, or VIENNA, AUSTRIA.

PRESSUR lCONTROLLER.

Application led April 9, 1923, Serial No. 631,003, and in Austria Apri1. '11, 1522.

This invention relates to pressure controlling valves 'of that class in which a valve body is connected with a piston acted upon by the fluid under pressure to be controlled.

5 Pressure controlling valvesJ of this class as heretofore constructed were open'to the objection that in most cases no rovisionv iS lnade at all for braking the va ve and piston movement, or only an insufficient one so to hammer so that they become unserviceable after a short time. Where a more efiicient braking is provided for the-action of the pressure controlling valve is too slow to 5 be satisfactory and moreover the tightly fit-- ting pistons are liable to stick fast.

The object 'of this invention is to provide a pressure controlling valve of the kind reerred to in which the above objections are avoided, further to provide a pressure con-` trollingvalve which promptly responds to any changes of pressure, is simple a'nd cheap .in construction, not liable to "get out ofv order, and .in which the piston `though not tightly fitting its guiding cylinder is securely packed by'a liquid packing. In the case of pressure controlling valves used xwith steam or other vapours the packing may be formed by the condensate of the steam or vapours. present invention consists `of a particular construction and arrangement ofthe valve body, the piston' and the means for o erating thesame as hereinafter more ful y described, with reference `to the annexed drawings illustrating by way of example various embodiments of this invention.

In the drawings Figs. `1 to 4 inclusive, are vertical sections of four constructional forms of the pressure controlling valve'embodying the present invention.

l Fig. 5 shows a modified detail.

- Fig. 6 shows another illustrated in Fig. 1 in vertical section. Figs. 7 to 11 inclusive, are vertical sections of modifications of the present pres- 'sure controlling valves,

' In Fig. 1, in the' valve casino' -1 a .piston guiding cylinderA ,2 `is mounte in which works the piston connected 4with the valve body 3 by a` rod 4. This rod is provided making contact with the joint between the that theparts are liable to' vibrate or even' With these objects in view thevalve in 'conjunctionwith the' valve 3. The

cylinder` 2 extends upwards to the cover of the caslng, a cylindrical extension thereof valve casing and its cover so that a packing or parts thereof there placed, cannot interfere with the movements/0f the piston. The pistonconsists Aof two discs 5, 6 between which and the side wall of the piston guiding cylinder there is formed a'space 7 which in any position ofthe piston communicates by openings 8 in'the wall of the guiding cylinder with the low pressure side ofthe valve. The space 9 between the bottom disc 5 of the piston and the bottom of the, guid-l ing-cylinder 2 serves a-s a dash pot and com- I municatesby the small opening 10 ywith the low pressure side of the valve. Owing to this arrangement always equal pressure acts on both sides of the disc 5 so that for any osition ofthe piston an equally good braklng action is secured below thedisc 5. "If steam vbe used as fluid underpressure then the condensate entering betweeen the sliding face of the piston and the cylindrical wall of the guiding cylinder forv the piston, serves as -an excellent' packing agent lwhich owing to the-equality of pressure on both sides cannot escape from"the place where it acts as a packing. For rendering this packing by the condensate stillmore efficient 1t. is advisable to provide the piston sliding surfaces with circumferential grooves as shown at 11 fortheupper piston disc 6. Byl the arrangement of the spaces of equal pressure and of the packing by the condensate it is possible to provide the piston with sliding surfaces of small width only and to fitv it loosely only into the piston guidingcylinder. Owing thereto-the packed joints become much less sensitive to any foreign bodieswhich may penetrate thereinto. In those cases where a noncondensing fluid under 9s pressure is used the packing and the brake action may be obtained by a liquid separately poured in or introduced into the grooves on the sliding surfaces. Also the piston rod guides may be packed bymeans of condensate by providing a circumferential groove 26 within the guide communicating by a pasysage 27 with the low pressure space so that also in the piston rod guide the s ame pressure is maintained as in the braking space.

In the upper disc 6 ofthe piston, openings 12 are provided which are closed by a spring' actuated valve 13.l 'Wben the pressure exceeds a certain permissible value, the valve 13 is lifted and theexcess of fluid under pressureescapes from the spface 7.' 'and through the safety valve 14 into the atmosphere. This valve 13 is laterally enlarged beyond its seat in the well known manner and so fitted into the disc 6 forming the valve seat that in its closed position an annular space 15 isfleft between the edge of thel are used, the'ininor one of which, 16, slides in an inner cylinder 1'8 concentric to the outer piston guiding cylinder 2. The brake space 9 isin this case formed between the outer piston and the piston guiding cylinder while :the hollow space of the inner piston 'communicates by large openings 19 with the low pressure space and has superimposed upon it the valve 13. The sliding surfaces of the pistons are provided with wide circumferential grooves 20 which permanently communicate .with lthe low pressure space by Athe openings-8 and 10 so that in this case too the saine pressure acts on both sides of the remaining small parts of the sliding surfaces, and the acking by the condensate is secured.- -The arge openings 19 have'for their result thatthe piston and the valve l body connected therewith can follow particularly rapidly the varying st eam consumption, without vibrations of 'the same beino'set up. The annular "space 15 bringf provided in l itself.

ing a out the lifting of the valve 13 is here the enlargement of the valve In the constructional form shown in Fig. 3 the head of the inner piston 16 is on the saine side' as thehead of the piston guiding i cylinder and the hollow spaces of the .two

concentric pistons are in open communicaf tion with each other. The cbrake space is.

here situated `between the'head of the inner piston and the (head of the piston guiding cylinder., The entire space between the-two pistons and the piston guiding cylinder communicates by the large openings 19 with the low pressure space so that the pressurev becomes rapidly operative von the entire piston and the latter can most rapidly vfollow the steam consumption. A hole 21 in the inner differs from that shown in Fig. 2 in that the -walls of the concentric pistons extend in opposite directions from the common hcd and the inner piston is gui-ded in the head of the piston-guiding cylinder.

For the purpose .of a i'apid lifting thc safety valve. 14 may be constructed similarly to the 'valve 13. lFig. 5 shows on a larger scale a cfmstructional form of thesafcty valve according to lthc invention.. As is seen in this case too 'the valve is laterally enlarged beyond its seat Vbut the enlargement is formed by `a ring 23 screwed on the valve and loosely fitting an annular guide 22; this ring too may be screwed in so that by adjusting the ring 23 orits guidc422; the time of the opening of the valve may be governed. I

The arrangement may also be such that the disc 24 transmitting the spring pressure -to the valve is also constructed as a sliding valve. For this purpose a guiding sleeve 25 screwed. into the. 'cover or spring casing is 'provided so that by adjusting this sleevev the time of the opening may be governed. In the case of such a construction of the lspring actuated disc fluid undei' pressure P does not escape, as in the'rst named constructional form below the disc at 28, but above the disc at 29.

It is essential for' the construction that the adjustable parts ,23, 22, 25 are so arranged that they are readily accessible from the outside. Indeed the adjustment may be readily effected through the escape opening 28 by means of a suitable tool.

For governing the pressure exerting fluid flowing through the passage 3() (Fig. 1) there is provided in the casing to the' upper side of the piston a governing valve 31 which is operated by'a .spring actuated diaphragm 32. shown in Fig. 6 on a larger scale constitutes a further part of the invention.

The valve holly 31.is connected with a rclief guiding. piston 33 mounted in av guiding The construction of this Valve which is' sleeve 34 and provided with a vscrew threaded extension projecting beyond thev guiding .'sleeve; onto this extension the ,spring casing The sleeve 34 is removably.

35 is screwed. mounted in the'cover of the controller and fixed in position by an annular plate 3G screwed on the cover.. After unscrewiug this plate 3 6 and the spring casing 35 the guide sleeve can be readily removed with the valve.'

body and replaced.

The guidel sleeve is provided with circun1'--. 'ferenti'al groove V37 extending downwards from the end of the passage'lf) and passages 38 lead from the lowermost part of the cir.- cumferential groove to the valve body. n By .m Y and the diaphragm space. The valve body 3 1 is surrounded by a' cage or shield 46 provided4 .so locating the passages 38 at a lower level 1 relatively to the valve bodyit is made possible to reduceto a minimum the length of v the rod connecting the valve body 31 and its piston 32 which is of particular' importance because thereby the danger that this small valve may break is materially reduced. On

-- the other hand the symmetrically arranged holes 12 ensure uniform distribution of the pressure of the fluid on the valve body 5 in the bore .leading to thepassage 30. Onl

the -outside this bore isI closed 'by a plug 42 which may besecured in position by lead sealing if desired.- Providinga throttling valve in advance of the controlling valve per-v mits. of a still better accommodation Jof the latter to give pressure conditions and thus l of a minimum wear of thepacking facesiv In Fig. 7I of the drawingsa pressure limit.

ingvalve is vshown having a' piston constructed 1n accordance Vwith the invention, 1n

lwhich, however, no valve is arranged in the piston, but a space 43 is provided in thev l cover, which is connected with. the high pres sure sideby the .passage 30 and is clo'sed on top by a diaphragm 48 under pressure which acts on a 'valve 45 shutting oif the top side .downwards towards the \valve seat and sol directing the iuid under pressure relativelyl .aft

of the piston from passage 44 leading to the escape side of the controller, a packing being interposed between the rod ot such'valve with openings `and preferably tapering vto the valve body that it. flows into the latter fromtopandlcloses` it'rapidly and reliably erl e pressure has sunk to the valve corresponding to the adjustment. In the assage 30a throttle lvalve -47 is provide by which the flow of thel fluid under lpressure 'to the space 43 can be throttled or shut off entirely .so that the arrangement of fa separate shutting off element is not necessary. The controller might also be 'derived from jthe automatic valve shown in Fig. 10. Whenuch a non-return; or automatic valve is used he' piston constructed according tothe invention offers all -the advantages already dev scribed. The Wide circumferential groove 20 inthe piston. communicates bv a hole l60 located near the piston bottom Y,with a space above the same, so that the condensate maypenetratetov the lower sliding .surface of the piston. .As the fiuid under pressure acts at all times on the inner piston open at its bottom side and on the valve body surrounded by the conical shield, shocks of the fluid un` der pressure are compensated.

.A particular advantage of the construc-` tion according to the invention is that it 'may be applied to all kindsy of controller going, corner, cross or other valves. n

The construction of therplston accordln'g to the invention .can also be used in valves for`high pressures and for larger dimensions ot the valves where the valve-body is pro-` vided with a relieving valve body?" Sucli caslngs. It may be provided in all throughf a construction in a non-return valve -1s shown in Fig. 8.

In the ma-in valve 3 connected with the piston the relief valve body ;5.9 is'mounted. ,The connection of this lvalve body 59 with the piston is efiected by a flange 61on a stud 62 fast .on the piston and having the same diameter as the relief valve seat. The valve body 3 which iis suitablyA guided is again I surrounded outside its seatby a shield 46 tapering. downwards. The hollowv 'piston forms again together with theguiding cylinder the braking space 9.and the second space ,7 or 20 permitting of the'packing by the condensate of the slidingl surfacethrough i the open communication with the high pressure side of thecontroller.

In the, cover. of the controller. there. is

lagain located the diaphragm '48 operating v the governing valve 45, the' diaphragm being operated the fluid under pressure lflowing valve 45 again shuts off the communication .through the paszage 30. The governing l between the space above the piston and the passage 44 leading to the escape side of the controller. Also two governing valves ,45" and 45" may be used 'as shown in Fig. 9, the seats of j which are `provided in atubular part of the v cover. One of the governing valves 45 is )l0 kept closed by a' diaphragm 48 the' otherwise closed space of which communicates only by apassageBO adapted to be adjusted ors'hut o with the valve space above the main' valve 3, the other valve 45'.l is heldin the;

open position by 'ai dialphragm'48f under pressure.' the space of. w

vonly bva passage 44 'which is likewi"e adapt#l ed to be'shut otl". When the pressure rises to -a higher valuev than' corresponds tothe piston, opens the smal'l'valve body '59 and this takeswith it the'v main valvegbody 3 .now relieved.

12oA l pressure on the diaphragm of the governf f- .ing valve 45 then this valve is raised, the'4 lpressure above the. piston diminishes the ,When the pressure falls below the prel determined value then the valve 45. closes, the pressure-above the piston becomes a ain equal to the valvepressure; the flowmg uid ll5 ich 1s in 'communication with the valve space below the valve i under pressure closes the main valve body 3 owing to its being guided by the shield 46 andthe Apiston follows with a smallvalve body 59 into the closed position owing to the excess opiessure on the stud reaching into the relief space.

When in the open position of. the governing valve 48 and therefore when the main Valve 3 is open, the pressure at the escape side of the valve rises so'far that it overcomes the pressure acting on the diaphragm of the second governing valve 48 and closes the latter, then again pressures are equalized above the piston and the main valve 3 lcloses in the manner above described.

In the constructional. form shown in Fig. 8

as well as in that shown in Fig. 9 in the pas sage 30, leading to the diaphragm 48 (or 48 azv is provided, which permits respectively) a throttling or shutting off valve 47 is provided -as well as in the escape passage 44 leading from the v alve 45 (or from the diaphragm 48" respectively) a throttling or shutting olli' valve 63 is provided. By shutting olf the valves 30 and 44 the valvel becomes .a shut olf valve. Further in this case too in the cover a port 55 adapted to be closed by a plug 56 and leading into the spa-cebelow the diaphragm 48 is provided, 4to which a pipe branche under pressuremay be connected.

InfFig. 10a further constructional form of such a non-return valve is shown in which another form of the piston and of the shield 46 isvused and moreover a further port .55 tb operate the diaphragm 48" by. a branch pipe connected to such port. Finally in Fig. 11 an analogous constructional formof such avalve is 'shown 1n which the governing valves 45.

and are constructed 'as double seatslid'- ing valves.

' Claims: a

1 In a pressure controlling valve the combination of a casing and a cover therefor and a .valve seatin the casing, with a valve, a' piston connected tor such valve, meansfor supplving Huid under pressure from the rst side of the said valve to one side ofone and the cylindrical inner face of the guide cylinder, a dash pot comprising an end-face end vface of such piston, a guiding cylinder in the said casing for the said piston, ,a space arranged concentrically relatively to the said piston and enclosed bythe piston of the piston and an end `face of the guide cylinder and 'means for permanently connecting the said space and theinterior of the dash pot in parallel to each yother with the iuid under pressure 'on the second side of the controlling valve and for permitting to escape from the said space any fluid under pressure leaking thereinto from the saidl first side of the controlling valve to the said second side 0f the controlling valve.

d olf f from another point of the-path of the fluid 'of lthe controlling arranged concentrically relatively to the said piston and enclosed by the piston and @the cylindrical`inner face of the guide cylinder, a dash pot comprising an end face of the' piston and an end face of the guide cylinder, and means for permanently connecting the .said space and the interior of the dash pot in-parall'el to each other with the fluid under pressure on the second side of the controlling valve and for permitting to escape from the said space any fluid under pressure leaking thereinto from thesaid irst side of the contrblling valve to the said second side of the controlling valve such means com prising openings inthe-side wall of the guiding cylinder. o

3. In a pressure controlling valve the combina tion ofa casing and a cover therefor and a valve seat in the casing with a valve, a piston connected to such valve, means for supplying fluid-under pressure from the lirst side of the said valve to one side of o ne end faceof such'piston, a guiding cylinder in the -said casing for the said piston, a space formed by a circumferential recess in the side wall of.the said piston and enclosed by the piston and the cylindrical linner face of the guide cylinder, end face of thepiston and an end face of the guideteylinder and means for permanently conne ing the said space and the interior of the dash pot in parallel to each other with the fluid under pressure on the second side said space any fluidy unto escape from-the thereinto from the said der pressure leaking first side of the controlling valve to the sai second side of the controlling valve.

4. In apressure controlling valve the combination of a casing and a cover therefor and a valve seat in the casing with a valve, a'

piston connectedwto such valve, means for supplying fluid under pressure from the iirst side of the said valve to one side of one end face of suchpiston, a guiding cylinder 1n the said casing for the said piston,- the guide' cylinder and the piston comprising each twol concentric parts cooperating with eachother vat least one of the piston parts being provided with a space formed by circumferential recess in the side part, andy enclosed by cylindrical innerfface of the corresponding guide cylinder part, one end face of oneoll wall of such pistonthe piston and the.

a dash pot comprising an valve and for permitting l d iio the cylinder parts and one end face of the l corresponding piston act in con]unction with eachother as a dash part being adapted to J 20 l end face of such piston, .a guiding cylinder lWand for permittin to escape pot and. means trolling valve and'for permitting to escape from the said space any fluid under pressure `leakingthereinto from the said first Side of the controlling valve to the said second -side bination of a casing and a cover-therefor and-.r

munication with the fluid under pressure on -the first side of the control valve with a of the controlling valve.

5. In a pressure controlling valve the com*- a valve seat in the casing, a shield surrounding and .connected at one end to the said valve seat'and open at its other end this centric-ally relatively -to the said piston and other end being in permanently open coinvalve, a piston connected to such valve, means l in the said casing Eor arranged concentrically relatively to the.

for supplying fluid'under pressure from the first side of the said'valve to one side'of one the said piston', a space said piston and enclosed by the'piston and the cylindrical inderz a dash pot comprising an end ,face o the piston and an end faceof the guide. o ylconnectdash pot in parall J thel second side of for permitting to escapev from the said space any fluid under pressure leaking,l thereinto from the 'said first side of the controlling valve tothe said second side of the-controlling valve.

. 6. .In a pressure controlling valve the combination of casii'ig and a cover therefor and a valve seat in the `casing a rustro conical shield surrounding and connected at its narrower end to 'the-said valve seat and open at its larger end this larger end being-in permanently open communlcation with the lfluid under pressure on. theiirst side of the cona piston connected trol valve with -a valve,` toisuchgvalve, mea for supplylng iuid.

under pressure from the first side ofthe said Y valve Vto one .iside of' one end face -ofsuch i closed bythe piston and the cylindrical ini guide cylinder,3a dash pot i. ner face of the "sing 'an'end face ofthepistonand'.

' `into from 56 piston, a guiding cylinder in the s aid casingl a space arranged concenor the said piston,

said piston and entrically.'relativelyx to the fluid un erl pressure leaking therespace'any the said first side of the controll .ling'valve to the said second sideV of the 00ntrolling valve. .Y 7.Y In a pressure controllmg valve the comguiding cylinder in the said casing a guide for the said piston-rod on the said piston casing,` av circumferential' inner face of the guide cylf into -and a valve seat bination `of a casing and a" cover'tlie1'efor rod, means for suppling fluid under pressure from the iirst s1 eof tthe said Valve to one side of one endface ofv such piston, a for the said piston,

groove surrounding the piston rod within thesaid piston rod guide, such in permanently open eommumcationv with the fluid under pressure on the second side of the control valve, a space arranged conon the second side of the controlling valve to escape from the said and 'for permittin spaceany iuid un er pressure leaking therefromthe said first side of the ling valve to the said lsecond side of thecon.- trolling valve.

8. In a pressure con rolling valve the coinbination of 'a casing and a cover therefor in the `casing with a valve,

oove being-- the said space controla piston connected to such valve, means for supplying iuid underpressure from the firstV the said valve to one side of the one side-of end face of such piston, a guiding cylinder in said casing for the said piston, a space arranged .concexitrically relatively to the said piston? and 'enclosed-Shy the piston and the cylindrical inner v:face of the guide cylinder, a jdash pot comprising an end face .of

'the pistonand an end face of the guide c ylinder4 and means for permanently connecting the said space .and the interior of the dash pot in parallel to each other with thefluid underA pressure on the.' second side of the controlling valve and for permitting" to escape from the 'said space anyA fluid under pressure leaking thereinto' from vthe sald first side of the controllinghvalve tothe said second side of the contro ngvalve, anda safe ty Yvalve mounted on thel said cover'y and adapted to limit the Huid pressure below the cover vthe said safety valve being later- 4ally enlarged beyond its seat and adapted to form an annular space between -it and the valve seat body. v Y 9. Ina pressure controlling bination-of a casingv anda and-a valve seat a piston connected to such valve,lmeans for supply' g H uid under pressure from the first. side of the 'saidwalve toene side of one end face of such piston, a guidin the said arranged. concentrically relatively to the cover thereforl thel casingwith -a valve,

valve the com-A cylinder in casing -for the sa'idplston, a spacev said piston and enclosed by the piston and the cylindrical inner face of the guide cvlinder, a dash pot comprising an end face of the piston and an vend face of the guide cylinder and means for permanently connecting the said space and the interior of the dash :pot in parallel to eacn other with the fiuid under pressure on the second side of the controlling valve .and for permitting to escape fromI the said space any Huid under pressure leaking thereinto from the said first side of the controlling valve to the said secing cylin er.'

ond side of the controlling valve, and a safety valve mounted on the said cover and adapted to limit the `iuid pressure below the cover the said safety valve comprising a valve body provided withr a laterally projecting ring and a valve seat provided with a ring axially projecting from it and adapted to embrace the said ring` von the valve body and means for axially adjusting at least one of the said rings. l'

10. In a pressure controlling valve the combination of a casing and acover.v therefor and a f valve seat in the casin @with al valve, a piston connected to suc valve,

means for supplying fluid under pressure from the first side ofthe said valve to' one side of one end face of such piston, a guiding .cylinder in the said 'casing for the said piston, a space arranged concentrically relatively to the said piston and enclosed bythe piston 'and the cylindrical inner face of the lng'vaIve, and 'a safety valve mounted on the said cover and adapted to limit the'fluid pressure below the covervithe said safety valve being provided with a disc adapted to be acted -upon by a' source of pressure a idin cylinder for such disc and lmeans or axlall adjusting the last named guid- 11. In a pressure controlling valve the combination of a casing and a cover therevalve, a piston .connected to suc for and a valvef seat in the casin with "a valve, means for supplyin fluid under, pressure ,from the first side o the 'said valve to one side of one end face of such piston, such means comprising a passage, a valve in such l passage anda valve seatka guide cylinder- ,for such valve,a circumferential roove on ,i this guide cylinder into which lea4 .the said passage, this groove ending in proximit to the. last `named valve seat, Vports lea g from the circumferential groove to a 'point adjacent to the valve, a guiding cylinder in the said casing for the said piston, a space arranged concentrically relatively to the lsaid piston and enclosed by the piston and the cylindrical inner face of the guidecylinder, a dash pot comprising an end face of the piston andV an end face of the guide cylinder and means for permanently connecting the said space and the interior of the dash pot in parallel to each other with the Huid under pressure on the second side of the controlling valve and for permitting to escape from the said space any iuid under pressure leaking thereinto from the said first side of the controlling valve to the said second side of the controllingvalve.` A

12. In a pressure controlling" valve the combination of a casing and acover therefor and a valve seat in the casingwith a valve, a piston connected to'such valve, meansrfor supplying Huid under pressure from the first-side of the said valve'to one side of one end faceof such` piston such means comprising a passage, a valve in suph passage and a valveseat, a guide lcylinder for such valve,

a circumferential groove on `this guide cylinder into which leads theI said passage, this s groove ending in proximity' to the last named valve ,seat ports leading from the circumferential groove to a point adjacent to the valve, a sleeve mounted inthe said circumferential groove and a perforated protecting cap enclosing -the valve body, a guiding cylinder in the said casing for the said piston, a space arranged concentri'call'y relatively to the'said iston and enclosed by the piston and the cy indrical inner face-of the l guide cylinder, a dash pot comprising an end face of the piston and an end face f the guide cylinder and means for permanently connecting the said space andthe interior of the dash pot in parallel to each other withV the fluid under pressure on the second sidel of the controlling valve an for permittingv to escape from the said space any -fluidunder pressurev leaking thereinto from the said rstside'of the controllin valve to--the said second side of the. contro in valve;

13. In a lpressure controllin combination of a casing and a cover therevalve, a piston connected to such valve through the medium of a relief valve theA body of such relief valve'being connected with play with t ejpiston rod and having itsseat in the sai valve, means for supplying iuid under pressure from the first side of the said valve to one side of one end face 1` g valve the,

v for` and a valve seat in the casing with a' 'i uoA piston and an end face of the guide c linder ing thereinto fromthe said'rst side of the and means for permanently connectmg the controllin Valve to the said second side of said. space and the interior of the dash pot in the contro ling valve. n e

parallel to eachother with the fluid under In testimony whereof I--have signed my' 5 pressureA on the secondside of .the controlnamdto this specification.

ling valve and for permittngto escape from` the said space any uid under pressure leak- Y A OTTO ROSCHA'NEK. 

